I sure its not able to syn up with Firewire..which is the biggest proble.
Id try different capture settings, also try trashin your preferences..
You might be out of luck though, I know alot of boxes out there with firewire ports..
My cable box has one, but I dont think FCP will synce up with it properly..
I have the same problem with an old JVC camera wont sync..
Only other suggestion is go through a break out box of some sort..AJA pinicle.. go Svideo in and AV and then go directly into you system
GOOD LUCK.